/**
 * 原型链
 */
function Person(first, last) {
    this.first = first;
    this.last = last;
}
Person.prototype.fullName = function() {
    return this.first + ' ' + this.last;
}


Person.prototype.abc = function(){
    return "abc"
}
let you = new Person('hh', 'ss')
console.log(you.fullName())
console.log(you.abc())